JP2002245718A - Stream data recording and reproducing device and transfer method for stream data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer stream data tentatively recorded by a recorder to the medium of the other recorder in stream data transmission on a bus for which copyright is protected. SOLUTION: Authentication is performed between a stream recording and reproducing device and the other recorder, a key for data scramble is exchanged, and by using the key, copy control information at the time of recording the data first is added, the data are transmitted and recorded in the recorder and then, they are erased from a source recording medium. While transmitting the data, the authentication from the other device is denied and a plurality of copying are not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stream data recording / reproducing apparatus for recording / reproducing stream data such as digital video / audio signals, and a data transfer method in the stream data recording / reproducing apparatus.

[0002]

2. Description of the Related Art With the development of digital video signal processing technology and recording / reproducing technology, a set-top box (STB) for receiving satellite broadcasts or CATV or a digital TV.
Digital broadcast receivers, digital VTRs, disk recorders, and the like can be realized as devices for ordinary households. When a video / audio signal is transferred between these digital AV devices, it is desired to transmit it as stream data in the form of a digital signal in order to prevent deterioration of signal quality. The most suitable digital interface for transmitting such stream data is I
There is a high-speed serial bus (hereinafter referred to as a 1394 bus) defined in the EEE1394-1995 standard. In the 1394 bus, up to 63 devices can be freely connected in a tree-like connection, with a maximum transfer speed of 400 Mbps and an isochronous transfer method suitable for transmitting data that needs to be transmitted in real time such as video and audio streams. It satisfies the requirements suitable for AV device connection.

On the other hand, recording / reproducing apparatuses such as digital VTRs record and reproduce signals in a digital system, so that there is essentially no change in signal quality due to repetition of recording / reproduction, so that the same copy as the original can be easily formed. It can be generated even once. This may lead to the possibility that a large number of copies of video and audio data (contents) whose copyrights are reserved, which are not different from the original, may be copied in large quantities beyond the range of use in ordinary households.

As a technique for preventing such illegal copying of contents, DTCP (Digital T)
transmission Contents Prot
The 1394 bus is used in the 1394 bus. In the DTCP system, data for authentication is added to each AV device that handles a copyrighted video and audio stream, that is, a broadcast receiver, a recording / reproducing device, a display device, etc. A stream receiving apparatus sends out a scrambled stream from a device that sends the stream (hereinafter referred to as a source device) so that data can be transmitted only between the streams, and obtains key data for descrambling in advance by authentication. The stream (hereinafter, sink device) receives and restores the stream, and reproduces or records the stream.

[0005] The video / audio stream is provided with copy control information in which conditions relating to data copying are described, whereby "copy free" (unlimited copy), "copy
It is classified into one of the following: "Never" (copy prohibited) and "copy one generation" (recordable devices such as digital VTRs have "copy free" or "copy free").
Only the stream of "copy one generation" can be received and recorded. When the stream of "copyone generation" is recorded, the copy control information is set to "no more copies".
(Not copyable). A device that reproduces and displays video and audio, such as a digital TV, can receive and reproduce a stream regardless of copy control information. As such a technique, for example, Japanese Patent Application Laid-Open No. H11-205
No. 310 is disclosed.

[0006]

In the DTCP system, "cop
When the content of "y one generation" is recorded on the recording / reproducing device, the copy control information for the content is changed to "no more copies" thereafter, and further recording by another recording device or the like is prohibited. On the other hand, recently, a stream recording / reproducing apparatus such as a so-called HDD recorder for recording video / audio stream data using a hard disk drive (HDD) has been realized, and in such an HDD recorder, the drive is fixed in the apparatus. Because of the limited capacity, users should delete content that they do not need to watch once and then save from the disc, and save content that they want to watch repeatedly later on the disc. If the free space on the disk is running low, save the content to be stored on a VTR or optical disk device. That you allow accumulated in storage media such as tape or optical disk is transferred to the on usability desirable.

However, in the above copyright protection method, the content once recorded on the recording medium is "no more cop".
ies ", it was impossible to copy it to a storage medium again, and storage by the user as described above could not be realized. It is an object of the present invention to provide a stream data recording / reproducing apparatus which enables a user to transfer content from a primary storage medium to a storage medium after protection.

[0008]

In order to achieve the above object, according to the present invention, when a content temporarily stored in a stream recording / reproducing apparatus is reproduced for the purpose of transfer to another recording apparatus, the content is not transmitted to the other recording apparatus. The devices mutually authenticate each other, and exchange and share key data for content scrambling. Then, the stream data scrambled using the key data is transmitted to the recording device by designating one transmission channel, and the content transfer is completed by ending the transmission of the content and deleting the content. While the transcription is being performed, an authentication request from another receiving device is rejected for this channel so that the content is not received by a plurality of devices at the same time.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an AV system using a hard disk recorder, which is an embodiment of a stream data recording / reproducing apparatus according to the present invention.
4, a hard disk recorder 1 and a digital video tape recorder 2, which are mutually 1394
It is assumed that they are connected by a bus.

The digital satellite broadcast receiver 3 has an antenna 31
The demodulated signal is demodulated by the front end 32, the desired program data is selected from the transport stream multiplexed by the demultiplexer 33, and is output from the interface unit 35 via the terminal 36 to the bus as a stream. The CPU 34 controls programs of the digital satellite broadcast receiver 3 by executing programs stored in a built-in memory or a memory (not shown). Further CP
The U34 reads the program guide information (EPG) from the received transport stream, generates operation screen data including screen data for presenting the program guide information to the user, and transmits this to the 1394 bus, or transmits the 1394 bus to the 1394 bus. Processing such as transmission and reception of a control command via the PC is performed.

The digital TV 4 receives the stream transmitted on the 1394 bus at the interface section 42 via the terminal 44a or 44b, and restores it into video and audio data at the decoder 43. The video data passes through the signal processing circuit 45. It is displayed on the CRT 46. The audio data is reproduced from an unillustrated speaker via an unillustrated audio signal processing circuit. The CPU 41 controls programs of the digital TV 4 by executing programs stored in a built-in memory or a memory (not shown). Further CP
U41 receives the screen data for controlling other devices connected by the 1394 bus and sends it to the signal processing circuit 4
5 for drawing and displaying on a memory included in the device 5, and transmitting and receiving commands for controlling other devices.

The disk recorder 1 receives the stream transmitted on the 1394 bus at the interface unit 14 via the terminal 15a, and the signal processing circuit 13
The data is converted to a data format for writing to the disk 1 and recorded on the disk 11. Further, the signal read from the disk 11 is converted into a stream format for transfer by the signal processing circuit 13, and the terminal 15 a
And 15b as a stream on the 1394 bus. The CPU 12 executes programs stored in a built-in memory or a memory (not shown) to control each unit of the disk recorder 1. Further, the CPU 12 performs processing such as creating screen data indicating the operation content of the disk device 1 and transmitting the screen data to the 1394 bus, and transmitting and receiving control commands via the 1394 bus.

The digital VTR 2 receives the stream sent on the 1394 bus at the interface unit 22 through the terminal 26, converts the stream into a recording format on a tape medium by a signal processing circuit 23, and attaches the stream to a rotating drum (not shown). The data is recorded on the tape 25 from the head 24. Conversely, the data read from the tape 25 by the head 24 is converted into a transfer stream format by the signal processing circuit 23, and the data is read from the interface unit 22 to the terminal 2.
6 on the 1394 bus. The CPU 21 executes programs stored in a built-in memory or a memory (not shown) to control each unit of the digital VTR 2, creates screen data indicating operation contents of the digital VTR 2, transmits the screen data to the 1394 bus,
Processing such as transmission and reception of commands for control via the four buses is performed.

FIG. 2 shows a more detailed configuration of the interface units 14, 22, 35, and 42 realized by a configuration common to the respective devices. The physical layer processing unit (PHY) 54 leading to the 1394 bus connector and the link layer processing unit (L
INK) 53 executes the processing of the physical layer and the link layer specified by the IEEE 1394 standard. It is connected to a FIFO 52 and an asynchronous transfer FIFO 55 for storing data transferred on the 1394 bus in the asynchronous transfer mode. The signal is processed and connected to a signal processing unit or the like inside the device. Isochronous transfer FIFO5
The input / output 5 is connected to the CPU inside the apparatus via the host interface 56. The CPU controls each unit of the interface unit via the other host interface 56, which transmits and receives control commands transmitted and received using the asynchronous transfer mode on the 1394 bus.

Next, the operation of the AV system shown in FIG. 1 will be described. First, when a program broadcasted by digital satellite broadcasting is received by the digital satellite broadcasting receiver 3 and viewed by the digital TV 4, a desired program is selected by the digital satellite broadcasting receiver 3, and this is streamed on the 1394 interface. And the digital TV 4 receives it and reproduces and displays it. The 1394 bus defines two modes, isochronous transfer and asynchronous transfer, and normally uses the isochronous transfer mode when a broadcast program stream is transferred in real time. The transmission format of the stream data and the control of the stream transmission / reception may use a method specified in the IEC61883 standard.

FIG. 3 shows a logical connection form in a case where stream data is transmitted from a digital satellite broadcast receiver to a digital TV according to a stream data transmission control system defined in the IEC61883 standard. IE
In the C61883 standard, a virtual stream data input / output unit called a “plug” is provided, and a logical data “connection” is set between plugs, thereby defining a stream data transmitting device and a stream data receiving device.

In the example of FIG. 3, an output plug 301 of the digital satellite broadcast receiver 3 and an input plug 401 of the digital TV 4 are provided.
Are connected using the isochronous data channel X on the 1394 bus, and the stream data is transmitted using this channel X. The control of stream data transmission and reception is executed by writing to a plug control register provided in a bus address space of each device connected to the 1394 bus. For example, an output plug of the digital satellite broadcast receiver 3 from the digital TV 4 is output. The connection is established by writing the transmission channel X to the register as the set value and the digital TV setting its own input plug register to receive the channel X, thereby establishing the connection. You will be able to send.

The connection can be established from the digital TV 4 side, ie, the sink side, as described above, or from the satellite broadcast receiver, ie, the source side. Further, the source side instructs the sink side to establish the connection. It is also possible to send a command to establish a connection. When terminating the transmission of the stream data, the established connection is discarded by writing data in the input plug register and the output plug register of each device so as to release the connection using the channel X. The IEC61883 standard defines a point-to-point connection connecting between an input plug and an output plug, and a broadcast connection connecting between an input plug or an output plug and an isochronous data channel. Unless there is a point-to-point connection, the connection is simply referred to as a connection.

Next, the operation when a satellite broadcast program is recorded by the disk recorder 1 will be described. In this case, as shown in FIG.
01 and an input plug 101 of the disc recorder 1 to establish a connection to transmit a program stream, and the disc recorder 1 records the stream on a disc. At this time, by receiving the stream of the same channel X by the digital TV 4, it is possible to perform a so-called recording monitor that decodes and displays the video of the stream recorded by the disc recorder.

In IEC61883, a connection can be added to a previously established connection so that a stream of the same channel can be used for another device. ". As shown in FIG. 4, a connection is established between the output plug of the digital satellite broadcast receiver 3 and the input plug 401 of the digital TV 4. In this case, first, the digital T
The input plug 10 of the disc recorder 1 is placed on the connection established for transmitting and viewing the stream to V4.
It is possible to overlay the connection to the digital TV 4 on the connection from the digital satellite broadcast receiver 3 to the disk recorder 1. When establishing a connection, as in the case of viewing, the connection may be made from any of the satellite broadcast receiver 3, the digital TV 4, and the disc recorder 1, or a command may be sent from the other party's device to send this. It may be executed.

Various operations can be considered for the user's operation in performing the recording operation. A command input by an operation of a remote controller or the like while watching a GUI screen displayed on the digital TV 4 is transmitted from the TV as a command to the 1394 bus. May be sent to the digital satellite broadcast receiver 3 and the disk recorder 1 via the digital satellite broadcast receiver 3, or a GUI screen generated by the digital satellite broadcast receiver 3 or the disk recorder 1 may be sent to the digital TV 4 for display. It is also possible to realize the recording by performing an operation by operating the remote controller or the panel of the machine 3 or the disc recorder 4 side.

A command for operating the digital satellite broadcast receiver 3 or the disk recorder 1 from the digital TV 4 or for establishing a connection with the other device is I
According to the command transfer protocol defined in the EC61883 standard, an AV / C command set defined by the 1394 Trade Association may be used as a command specification for controlling the AV device. As a method for transmitting the GUI screen to another device, a method defined in the EIA775A standard, a method using the panel subunit indicated by the above-mentioned AV / C command set specification, a network control specification of the AV device, and the like are used. HAVi (Home Audio)
o Video interoperability)
It is possible to use a method for realizing a GUI specified in the specification.

Next, a case where a broadcast program recorded on the disc recorder 1 is reproduced and displayed on the digital TV 4 will be described. FIG. 5 shows a transmission state of the stream when the stream is transmitted from the disk recorder 1 and displayed on the digital TV 4. In this case, a connection is set from the output plug 102 of the disc recorder 1 to the input plug 401 of the digital TV 4, and the stream received by the digital TV 4 is decoded and displayed so as to transmit the stream. Various forms are conceivable for a device for establishing a connection and a method of user operation as in the case of viewing and recording.

When recording or reproducing a stream with the digital VTR 2, the input plug 201 of the digital VTR 2 is used as in the case of the disk recorder as shown in FIG.
Alternatively, the output plug 202 and the output plug 301 of the digital satellite broadcast receiver 3 or the input plug 4 of the digital TV 4
It is sufficient to establish a connection between each of these and to transmit a stream.

The above description has been made without taking into account the case where copy restriction is imposed on a program received from satellite broadcasting. A program received from a satellite broadcast or the like and recorded on a disk recorder is transmitted as a stream on a bus, and can be copied if received by another disk recorder or a digital VTR. IEEE139
4 and IEC61883, there are no particular restrictions on the devices that can transmit and receive streams. By overlaying connections as described above, the stream flowing on the bus can be transmitted to any other device. However, it was basically possible to receive and use it, and it was also possible to record one stream simultaneously with a plurality of devices and make many copies.

The copyright of a broadcast program or the like is reserved, and content such as a movie, for which it is necessary to limit the production of copies in order to protect the rights of the copyright holder, is transmitted on a 1394 bus. In order to prevent such contents from being copied indefinitely, D is a standard that defines copyright protection specifications on the 1394 bus.
TCP (Digital Transmission)
Content Protection) method is used.

According to the DTCP method, when content whose copyright is reserved and whose copy is restricted is to be transmitted as a stream on a 1394 bus, the content is mutually authenticated using authentication information built in the device in advance. The other device is authenticated, and only when the authentication is successful, key data for scrambling and transmitting the content is shared with each other, and the encrypted content stream is transmitted from the source device to the 1394 bus. Then, by restoring the stream received on the sink side using the shared key, transmission / reception of content can be performed only between devices having authentication information.

FIG. 7 shows a transmission procedure when transmitting contents with copy restrictions from the digital satellite broadcast receiver 3 to the disk recorder 1 in the AV system shown in FIG. In FIG. 7, when trying to transmit a stream from the satellite broadcast receiver 3 to the disk recorder 1, first, as described above, a connection is made between the output plug of the satellite broadcast receiver 3 and the input plug of the disk recorder 1. Is established (procedure 1001), key data for encrypting the content is generated by the satellite broadcast receiver 3 on the source side (procedure 1002), and the stream scrambled by the key data is placed on the bus. Transmission is started (procedure 1003). When the disk recorder 1 on the sink side receives the scrambled stream,
An authentication request is issued to the source side (procedure 1004), and the source and sink mutually authenticate each other, and exchange key data (procedure 1005). If the authentication succeeds, the sink can calculate the key data for content encryption, and calculate this value (step 100).
6) The stream sent from the source side can be decoded and received (procedure 1007).

When the transmission of the stream is completed, the stream from the source side is stopped (step 1008), and the connection between the source and the sink is discarded (step 1008).
9), the key data on the source side and the sink side are discarded (procedures 1010 and 1011). Content copy restrictions are "copy free", "copy never", "copy one generation"
And "no more copies" are identified using copy control information provided with four levels. FIG. 8 shows the format of a data packet in the isochronous transfer mode used for transmitting stream data on the 1394 bus. The packet consists of 32-bit header information and a CR
C, a data field and a data CRC.
The header information is a 16-bit Dat indicating the length of the packet.
a Length field, Tag field used to identify the data format of the packet, Channel field indicating the isochronous channel number used to transmit the packet, Tcode indicating the type of transaction of the packet, Sy field used to synchronize data (Sync). Using the upper two bits of the Sy field,
By assigning a value indicating each level, copy control information of the content transmitted by the stream is identified.

The content of "copy free" is not restricted in copying, and can be freely transmitted and received by any device, and does not need to be scrambled when transmitting / receiving to / from the bus. The other three levels "copy never", "copy on"
The contents of "e generation" and "no more copies" are restricted in copying and must be scrambled when transmitted on the bus.The contents of "copy never" are received by a recording device such as a disc recorder or VTR Cannot be stored in a medium, and a transmitted stream can be received only when a recording operation is not performed, for example, when a satellite broadcast receiver transmits to a digital TV for viewing. The content of "one generation" can be recorded in the recording device. However, when the content is reproduced once and then transmitted from the recording device and transmitted, the copy control information must be changed to "no more copies" and transmitted. The content of "no more copies" is "
Only the generated data is allowed to be displayed in the same way as "copy never". In a device having information for authentication, copy processing is restricted in the DTCP method by always correctly executing content processing in accordance with the above-described copy control information. Content that has been illegally copied.

Next, an operation of transferring (or moving) content recorded on a disk recorder to a digital VTR according to an embodiment of the present invention will be described. Transcription is the process of transmitting content from the source device to the sink device, recording the content received by the sink device, and deleting the content at the source device after transmitting the content, or After confirming that the content received by the device has been recorded,
The source device deletes the transmitted content to move the content from the source device to the sink device.

FIG. 9 shows a stream transmission procedure in the case of performing transcription. This example shows a case where the content recorded as “no more copies” on the disc recorder 1 shown in FIG. 1 is transferred to the digital VTR 2. Operation of the panel or remote control by the user,
Alternatively, when the disc recorder 1 is instructed to transfer the content to the digital VTR 2 by receiving a command from another device, the disc recorder 1
A connection is established between the server and the server (step 1101), and key data for scrambling is generated (step 1102).
The transmission of the stream with copy control information of "y one generation" is started (step 1103). The stream at this time may not be the stream itself containing the content to be transcribed, but may be the stream containing a dummy blank signal or the like. In response to this, the digital VTR 2 requests authentication from the disk recorder 1 (procedure 1104), authenticates each other between the source and sink, and when the authentication is successful on both sides (procedure 1105). ),
Key data can be generated by calculation on the sink side (procedure 1106), and key data for scrambling content is shared. Thereafter, the disc recorder 1 sends a command to put the digital VTR 2 into the recording state (procedure 1107), locates the content to be transcribed (procedure 1108), scrambles from the beginning of the content, and performs "copy one generation". The transmission of the stream to which the control information has been given is started (step 1109). The digital VTR 2 receives the transmitted stream, descrambles it, and records it on the tape as "no more copy" information. (Procedure 1110) That is, the copy control information once recorded on the subsequent disc recorder 1 for the first time is added to the stream, transmitted to the digital VTR 2, recorded, and then erased from the disc recorder 1, which is the original recording medium. .

Instead of sending a command to the digital VTR 2 to start recording, it is also possible to operate the panel or the remote controller of the digital VTR 2 to put it in a recording state, and then operate the disk recorder 1 to start stream transmission. In this case, the user interface information generated by the disc recorder displays a message such as "Please put the VTR in the recording state" and waits for the transmission start operation, so that the user can understand the operation method. It can be easily presented.

During content transmission, the disk recorder 1 periodically transmits a command to check the operation state of the digital VTR 2 (step 1111), and checks that a response indicating that a recording operation is being returned from the digital VTR 2 (step 1112). . If it is determined that the recording operation is continuing normally, the content that has been transmitted so far is erased from the disk (step 1113). On the other hand, the recording operation of the digital VTR 2 is stopped by a user's operation or other reasons, and when this is detected by means such as the response of the command, or when the cable of the 1394 bus is disconnected, the disc recorder and the digital VTR 2 are disconnected. When the connection with the connection stops, the transmission of the stream is stopped, and the content to be transcribed thereafter is retained in the disc. In this way, by erasing the content little by little during the transcription operation, the operation is stopped immediately before the termination of the transcription operation, and it is possible to prevent a large number of copies from being easily created by re-transferring from the beginning,
It is possible to prevent the data to be transcribed from being lost when the recording of the content in the digital VTR 2 cannot be performed for some reason.

Also, in the case where an authentication request is made from a sink device other than the digital VTR 2 during the transfer operation, for example, a device other than the digital VTR 2 which first authenticates, such as a digital TV, another digital VTR, or a disk recorder. (Step 1114) rejects this (Step 1)
115) By doing so, it is possible to prevent a plurality of copies from being generated in addition to the transcription.

When all the contents to be transcribed have been transmitted, the disc recorder stops sending the stream (step 1116), deletes the contents remaining in the disc of the disc recorder 1 (step 1117), and discards the connection. (Step 1118). As a result, the content scramble key shared by both parties is discarded (step 11).
19, procedure 1120), and the transfer operation ends.

As described above, the content of "no more copies" recorded on the disc recorder 1 is
The data can be transcribed to the digital VTR 2, and at that time, there is no possibility that the data is simultaneously recorded in another recording device and a plurality of copies are generated. On the other hand, the digital VTR 2 does not need to consider that it is a transcription operation,
It works exactly the same as recording the content of "generation." There are no restrictions on copying "copy"
It is not always necessary to perform such a transfer operation for “free” contents, and the remaining contents may be deleted after performing normal copying. However, as described above, the contents having copy restrictions are transferred. In the same manner as described above, it is possible to simplify the operation of the user by sequentially deleting the contents. After the end, a command to temporarily put the VTR in a pause state is sent, and when the transmission of the next content is ready, the pause may be released and then the transmission of the content may be started. Can be prevented from occurring.

FIG. 10 shows an operating state in which a stream transmitted from the disk recorder 1 to the digital VTR 2 is transcribed while being monitored by the digital TV 4. First, the output plug 1 of the disc recorder 1
A connection 02 is established between the input plug 401 of the digital TV 4 and the channel X using the channel X, and is transcribed from the disk recorder 1 by operating the panel or remote controller of the disk recorder 1 or an operation from a control application on the digital TV 4 side. Check the content and select the content. Then, the digital V is applied to the disc recorder 1 by any of the above methods.
When the transfer to the TR2 is instructed, the disc recorder 1 outputs the output plug 103 and the input plug 20 of the digital VTR2.
1 and a new connection is established using a channel Y different from the channel X used by the connection already established with the digital TV 4 in the same manner as the procedure shown in FIG. To perform a transfer operation with the digital VTR 2. When performing transcription, destroy the connection established with the digital TV,
Alternatively, the stream transmission may be stopped while the connection is maintained, and the empty packet may be continuously transmitted. Or 13 which can transmit 2 channels simultaneously
Using the H.94 interface, the digital TV 4 may transmit the stream as "no more copies" while transmitting the same content as "copy one generation" to the digital VTR 4 and turn around. Can simultaneously monitor the transcribed content on the digital TV 4.

By using a channel different from the connection already established with the digital TV or the like, even if a recording device other than the digital TV is already overlaid on the same channel, this recording device can be used. Can be prevented from being recorded. If a 1394 interface capable of simultaneously outputting two channels is used, the content being transcribed can be monitored on a digital TV.

In the above example, the embodiment in which the present invention is applied to a single disk recorder device has been described. The stream data recording / reproducing apparatus of the present invention is not limited to the above example, and may be, for example, a composite apparatus in which a satellite broadcast receiver and a disk recorder are integrated. Even in that case, a digital VTR is connected by a 1394 bus. It is possible to transfer the content in exactly the same manner.

In the above embodiment, the recording and reproduction of a multiplexed data stream of video and audio as stream data has been described as an example. However, the present invention is not limited to the type of stream data, and the present invention is not limited to this. Or XML (extended Mar
The present invention is also applicable to a recording / reproducing apparatus for recording / reproducing a data broadcast stream described in “Kup Language” or the like, or a stream obtained by multiplexing them.

[0042]

According to the present invention, copy-limited content once recorded by a stream data recording / reproducing apparatus can be transcribed to another stream data recording / reproducing apparatus. There is no danger of being created.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an AV system including a stream data recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of an interface means of the stream recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a data transmission method between a digital satellite broadcast receiver and a digital TV.

FIG. 4 is a diagram illustrating a data transmission method between a stream recording / reproducing apparatus, a digital satellite broadcast receiving apparatus, and a digital TV according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a data transmission method between a stream recording / reproducing apparatus, a digital satellite broadcast receiving apparatus, and a digital TV according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a data transmission method between a digital VTR, a digital satellite broadcast receiver, and a digital TV.

FIG. 7 is a sequence diagram showing a data transmission procedure between a stream data recording / reproducing apparatus and a digital satellite broadcast receiving apparatus according to one embodiment of the present invention.

FIG. 8 is a diagram showing a transmission packet format of stream data.

FIG. 9 is a sequence diagram showing a data transmission procedure between a stream data recording / reproducing device and another recording device according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating a data transmission method among a stream recording / reproducing apparatus, a digital satellite broadcast receiving apparatus, and a digital TV according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disk recorder 2 ... Digital VTR 3 ... Satellite broadcast receiver 4 ... Digital TV 11 ... Hard disk 12, 21, 34, 41 ... CPU 13, 23, 45 ... Signal processing circuit 14, 22, 35, 42 ... Interface means 15a , 15b, 26, 36, 44a, 44b Terminal 24 Head 25 Tape 31 Antenna 32 Front end 33 Demultiplexer 43 Decoder 46 CRT 51 Encryption / decryption means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H04N 5/765 H04N 5/781 510F 5/781 5/91 P 5/91 5/92 H 5/92 ( 72) Inventor Atsushi Yoshioka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Hiroo Okamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (Reference) 5C053 FA13 FA20 FA23 GA11 JA30 KA24 LA06 LA07 5D044 AB05 AB07 BC01 BC04 CC03 CC04 DE50 GK17 HL08 5J104 AA07 AA13 AA16 EA04 EA16 KA02 KA06 NA02 PA05 PA14

Claims (19)

[Claims] 1. An interface means for transmitting and receiving stream data and control data, a built-in or removable recording medium for recording received data, an encryption means for scrambling data to be transmitted, Decoding means for descrambling the received data, and performing scramble processing or descrambling processing by performing authentication processing with another apparatus which transmits or receives stream data via the interface means. The key information is exchanged, and the data obtained by controlling the descrambling process according to the copy control information added to the received stream data and the information based on the copy control information are recorded on the recording medium, and read out from the recording medium. By the encryption means with information based on the copied control information In a stream data recording / reproducing apparatus for transmitting stream data and copy control information obtained by controlling a scrambling process via the interface means, read data recorded on the recording medium after descrambling by the decoding means When transmitting the data as stream data from the interface means after scrambling by the encryption means, the data may be kept stored in the recording medium even after the data is read, or the data may be read after the read. A stream data recording / reproducing apparatus, wherein copy control information added to the transmitted stream data is changed depending on whether the stream data is to be erased from a recording medium. 2. The stream data recording / reproducing apparatus according to claim 1, wherein when erasing the data after reading the data from the recording medium, the same copy control information as when the data was recorded is added. The data is transmitted as stream data from the interface means, and when the data is kept stored, the stream data transmitted from the interface means is transmitted with copy control information indicating that recording is impossible. Stream data recording and reproducing apparatus. 3. An interface means for transmitting and receiving stream data and control data, a built-in or detachable recording medium for recording received data, an encryption means for scrambling data to be transmitted, Decoding means for descrambling the data, and setting a channel for transmitting stream data on a bus signal line connected to the interface means and enabling data exchange with another device. Exchanges key data for performing scramble processing with the encrypting means on the data to be transmitted on the channel by performing authentication with the destination apparatus, or for descrambling with the decrypting means, It is obtained by controlling the descrambling process according to the copy control information added to the received stream data. The data based on the data and the copy control information are recorded on the recording medium, and the stream data and the copy control information obtained by controlling the scrambling process by the encrypting means with the information based on the copy control information read from the recording medium. A stream data recording / reproducing apparatus for transmitting the data recorded on the recording medium using the key data by the encryption means, and then performing a scramble process on the data recorded on the recording medium using the key data. After reading the data, the data is erased from the recording medium, and during the transmission of the stream data, authentication with a device other than the transmission destination device connected to the bus signal line is rejected. Stream data recording and reproducing apparatus. 4. An interface means for transmitting and receiving stream data and control data, a built-in or removable recording medium for recording received data, an encryption means for scrambling data to be transmitted, Decoding means for descrambling the data, and setting a channel for transmitting stream data on a bus signal line connected to the interface means and enabling data exchange with another device. Exchanges key data for performing scramble processing on data to be transmitted on the channel and descrambling the data to be transmitted on the channel by performing authentication with the transmission destination apparatus, and adding the data to the stream data received by the interface means. Control the descrambling process according to the copy control information The data and the information based on the copy control information are recorded on the recording medium, and the stream data and the copy control information obtained by controlling the scramble processing by the information based on the copy control information read from the recording medium are transmitted through the interface means. When erasing data read from the recording medium after reading the data read from the recording medium, a second channel different from the already set channel is set, Exchanges key data for performing scramble processing on data to be transmitted on the second channel or descrambling the data with the second channel, and replaces the data recorded on the recording medium with the key data. After scrambling using the second channel from the interface means. The same copy control information as when the data was recorded is added and transmitted as stream data, and the key data used in the second channel is shared while the stream data is transmitted on the second channel. A stream data recording / reproducing apparatus characterized by rejecting an authentication attempted by another apparatus. 5. The stream data recording / reproducing apparatus according to claim 4, wherein when the second channel is set, the previously set channel for transmitting the stream data is discarded, and the second channel is set. A stream data recording / reproducing apparatus, which performs stream transmission only by using a stream data. 6. The stream data recording / reproducing apparatus according to claim 4, wherein when the second channel is set, an empty packet is sent to a channel for transmitting stream data which has been set, A stream data recording / reproducing apparatus for performing stream transmission by watching on a second channel. 7. The stream data recording / reproducing apparatus according to claim 4, wherein the stream transmitted from the second channel by using both the second channel and the already set first channel. The data is transmitted with the same copy control information as when the data was recorded, and the stream data transmitted from the first channel is transmitted with the copy control information indicating that recording is not possible. A stream data recording / reproducing apparatus characterized by the above-mentioned. 8. The stream data recording / reproducing apparatus according to claim 4, wherein the stream data is transmitted from the second channel to a recording apparatus that records the stream data, and A stream data recording / reproducing device for transmitting stream data to a display device for reproducing and displaying the stream data from a channel in which the stream data is recorded. 9. The stream data recording / reproducing apparatus according to claim 3 or 4, wherein when reading and erasing data recorded on the recording medium, the stream data recording / reproducing apparatus operates with respect to the transmission destination apparatus. Is repeatedly transmitted, and if it is confirmed that the transmission destination apparatus has recorded the received stream by the response to the command, the data transmitted so far is deleted from the recording medium, If the transmission destination device detects that the recording operation has been interrupted, or if the transmission of stream data cannot be performed, the data reading is stopped,
A stream data recording / reproducing apparatus which retains data remaining on the recording medium at that time. 10. The stream data recording / reproducing apparatus according to claim 3, wherein a channel for transmitting the stream data is set, authentication is performed with the destination apparatus, and the destination apparatus is used. Cueing data to be transmitted to the transmission destination device, transmitting a command for instructing recording start to the transmission destination device, and transmitting a scrambled stream from a head portion of the cueed data to the channel. Stream data recording and reproducing apparatus. 11. A stream data recording / reproducing apparatus according to claim 10, wherein after reading of data being transmitted to said transmission destination apparatus is completed, a command for instructing a temporary stop of recording is transmitted to said transmission destination apparatus. Then, the cue of the data to be transmitted next is performed to the transmission destination device, and a command to start recording is transmitted to the transmission destination device,
A stream data recording / reproducing apparatus for transmitting a stream that has been scrambled from the head of the cueed data to the channel. 12. The stream data recording / reproducing apparatus according to claim 3, further comprising display means for displaying an operation method, setting a channel for transmitting said stream data, and establishing a communication with said destination apparatus. Authentication between the devices, finds the data to be transmitted to the transmission destination device, displays a message for causing the transmission destination device to start recording by the display unit, and performs an operation from the user. A stream data scrambled stream is transmitted to the channel from the head of the cueed data. 13. An interface means for transmitting and receiving stream data and copy control information data, for performing scramble processing or descrambling processing by performing authentication processing with another apparatus for transmitting or receiving stream data. In a stream data recording / reproducing apparatus for exchanging key information and recording / reproducing stream data on a built-in or detachable recording medium, the received data is decrypted and descrambled, recorded on the recording medium, and the recorded data is recorded on the recording medium. When the data is read, encrypted, scrambled, and transmitted as stream data from the interface means, the data is kept stored in the recording medium even after the data is read, or the data is stored in the recording medium after the data is read. Depending on whether to erase from A stream data recording / reproducing apparatus, wherein copy control information added to stream data to be transmitted is changed. 14. A stream data recording / reproducing apparatus according to claim 1, wherein said built-in recording medium is a hard disk drive. 15. The stream data recording / reproducing apparatus according to claim 1, wherein said removable recording medium is a recordable and erasable optical disk. Recording and playback device. 16. An interface means for setting a channel for data transmission with another apparatus to transmit / receive stream data and transmitting / receiving control data, and a built-in or detachable unit for recording received data. It has a possible recording medium, an encryption unit for scrambling the data to be transmitted, and a decryption unit for descrambling the received data, and performs authentication between other devices that transmit or receive the stream data. By performing processing, key information for scramble processing or descrambling processing is exchanged, and data obtained by controlling descrambling processing according to copy control information added to received stream data and information based on copy control information Is recorded on the recording medium, based on the copy control information read from the recording medium. A stream data transfer method used in a stream data recording / reproducing apparatus for transmitting stream data and copy control information obtained by controlling a scrambling process according to the information through the interface means, wherein the data read from the recording medium is scrambled. Generating key data for processing, setting a data transmission channel for transmitting stream data from the interface means, and performing authentication between the stream data transmission destination device and the key data. Sharing, reading the data read from the recording medium by the encryption means using the key data, scrambling the data, adding copy control information on the data transmission channel from the interface means, and transmitting the data as stream data. The transmission channel While the stream data is being transmitted using the channel, the sharing of the key data by an authentication request from a device other than the transmission destination device is refused, and after the transmission of the stream data, the data read and transmitted from the recording medium is transmitted. And deleting the transmission channel and the key data from the recording medium. 17. The stream data transfer method according to claim 16, wherein during the transmission of the stream data, a command for repeatedly inquiring about an operation state of the transmission destination device is transmitted, and a response to the command is transmitted. When it is confirmed that the destination device records the received stream, the data transmitted so far is deleted from the recording medium, and the destination device suspends the recording operation. Detecting that the reading has been performed, or when the transmission of the stream data cannot be performed, stopping the reading of the data and holding the data remaining on the recording medium at that time as it is. A stream data transfer method characterized by the above-mentioned. 18. A stream data transfer method according to claim 16, wherein a channel for transmitting stream data is set for a transmission destination device, and after authenticating with said transmission destination, At the same time as starting transmission from the head of data to be transmitted to the transmission destination device, a recording start command is transmitted to the transmission destination device, and the transmission start command is transmitted to the transmission destination device. Recording method for stream data. 19. A stream data transfer method according to claim 16, wherein a channel for transmitting stream data is set for a transmission destination device, and after authentication with said transmission destination is performed, A display to the user is performed so as to cause the destination device to perform a recording operation, and the user operation is set to a standby state in which transmission from the beginning of data to be transmitted to the destination device can be started. A method of transferring stream data, comprising the step of waiting and causing the destination device to record the data from the beginning.